Patchwork [Fortran-Dev,committed] Set elem_len and use proper element size for stride handling

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Submitter Tobias Burnus
Date May 7, 2013, 9:58 a.m.
Message ID <5188D056.7090006@net-b.de>
Download mbox | patch
Permalink /patch/242172/
State New
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Comments

Tobias Burnus - May 7, 2013, 9:58 a.m.
This patch properly sets the elem_len in gfc_array_init_size; it 
probably could restricted to do so only for BT_CLASS and for 
deferred-length BT_CHARACTER as otherwise the correct elem_len is set.

Additionally, the stride handling now uses elem_len to convert from/to 
the stride multiplier instead of the declared TYPE_UNIT_SIZE. The latter 
doesn't properly work for strings (at least not in all cases) and 
(never) for polymorphic variables.

The code keeps using the declared size for nonstrings/record types. The 
reason is that the declared size is a compile-time constant. Using 
elem_len would otherwise cause problems, e.g., with vectorization as the 
vectorizer cannot see that the memory access is contiguous.

(The other patch removes some code which used to be:  new_ubound = 
old_ubound + (old_lbound-new_lbound); with the change of the array 
descriptor to extents, the code was now effectively "new_extent = 
old_extent", which is pointless.)


This patch brings down the regression-test failures from 15 to 6. Still 
failing are:
gfortran.dg/auto_char_len_3.f90
gfortran.dg/mvbits_7.f90
gfortran.dg/mvbits_8.f90
gfortran.dg/proc_decl_23.f90
gfortran.dg/subref_array_pointer_2.f90
gfortran.dg/transfer_intrinsic_3.f90
gfortran.dg/unlimited_polymorphic_1.f03

Besides solving those regressions, the main task is still outstanding: 
Removal of "offset". Additional tasks are lower_bound == 0 for actuals 
to nonpointer/nonallocatables dummies and the proper handling of 
subpointers (i.e. sm != n*elem_len).


Committed as Rev. 198669 after building and regtesting on 
x86-64-gnu-linux. Additionally, I have updated the branch to the trunk, 
Rev. 198670.

Tobias

Patch

2013-05-07  Tobias Burnus  <burnus@net-b.de>

	* trans-array.c (gfc_conv_descriptor_stride_get,
	gfc_conv_descriptor_stride_set): Use elem_len, unless it is
	a nonstring intrinsic type for which size_in_bytes is used.
	(gfc_array_init_size): Set elem_len before handling the
	strides.
	* trans-expr.c (gfc_conv_subref_array_arg): Remove no-op
	extent shifting code.

diff --git a/gcc/fortran/trans-array.c b/gcc/fortran/trans-array.c
index 08f12aa..db8de69 100644
--- a/gcc/fortran/trans-array.c
+++ b/gcc/fortran/trans-array.c
@@ -422,7 +422,11 @@  gfc_conv_descriptor_stride_get (tree desc, tree dim)
     return gfc_index_one_node;
 
   tmp = gfc_get_element_type (type);
-  size = size_in_bytes (tmp);
+  if (TREE_CODE (tmp) != RECORD_TYPE && !TYPE_STRING_FLAG (tmp))
+    size = size_in_bytes (tmp);
+  else
+    size = gfc_conv_descriptor_elem_len_get (desc);
+
   size = fold_convert (gfc_array_index_type, size);
   tmp = fold_build2_loc (input_location, FLOOR_DIV_EXPR, gfc_array_index_type,
 			 gfc_conv_descriptor_sm_get (desc, dim), size);
@@ -440,7 +444,11 @@  gfc_conv_descriptor_stride_set (stmtblock_t *block, tree desc,
 {
   tree tmp;
   tmp = gfc_get_element_type (TREE_TYPE (desc));
-  tmp = size_in_bytes (tmp);
+  if (TREE_CODE (tmp) != RECORD_TYPE && !TYPE_STRING_FLAG (tmp))
+    tmp = size_in_bytes (tmp);
+  else
+    tmp = gfc_conv_descriptor_elem_len_get (desc);
+
   tmp = fold_build2_loc (input_location, MULT_EXPR, gfc_array_index_type,
 			 fold_convert (gfc_array_index_type, value),
 			 fold_convert (gfc_array_index_type, tmp));
@@ -5117,6 +5125,34 @@  gfc_array_init_size (tree descriptor, gfc_typespec *ts,
   tmp = gfc_conv_descriptor_dtype (descriptor);
   gfc_add_modify (descriptor_block, tmp, gfc_get_dtype (ts));
 
+  if (expr3_elem_size != NULL_TREE)
+    tmp = expr3_elem_size;
+  else if (expr3 != NULL)
+    {
+      if (expr3->ts.type == BT_CLASS)
+	{
+	  gfc_se se_sz;
+	  gfc_expr *sz = gfc_copy_expr (expr3);
+	  gfc_add_vptr_component (sz);
+	  gfc_add_size_component (sz);
+	  gfc_init_se (&se_sz, NULL);
+	  gfc_conv_expr (&se_sz, sz);
+	  gfc_free_expr (sz);
+	  tmp = se_sz.expr;
+	}
+      else
+	{
+	  tmp = gfc_typenode_for_spec (&expr3->ts);
+	  tmp = TYPE_SIZE_UNIT (tmp);
+	}
+    }
+  else
+    tmp = TYPE_SIZE_UNIT (gfc_get_element_type (type));
+
+  /* Convert to size_t.  */
+  element_size = fold_convert (size_type_node, tmp);
+  gfc_conv_descriptor_elem_len_set (descriptor_block, descriptor, element_size);
+
   or_expr = boolean_false_node;
 
   for (n = 0; n < rank; n++)
@@ -5249,36 +5285,6 @@  gfc_array_init_size (tree descriptor, gfc_typespec *ts,
 	}
     }
 
-  /* The stride is the number of elements in the array, so multiply by the
-     size of an element to get the total size.  Obviously, if there is a
-     SOURCE expression (expr3) we must use its element size.  */
-  if (expr3_elem_size != NULL_TREE)
-    tmp = expr3_elem_size;
-  else if (expr3 != NULL)
-    {
-      if (expr3->ts.type == BT_CLASS)
-	{
-	  gfc_se se_sz;
-	  gfc_expr *sz = gfc_copy_expr (expr3);
-	  gfc_add_vptr_component (sz);
-	  gfc_add_size_component (sz);
-	  gfc_init_se (&se_sz, NULL);
-	  gfc_conv_expr (&se_sz, sz);
-	  gfc_free_expr (sz);
-	  tmp = se_sz.expr;
-	}
-      else
-	{
-	  tmp = gfc_typenode_for_spec (&expr3->ts);
-	  tmp = TYPE_SIZE_UNIT (tmp);
-	}
-    }
-  else
-    tmp = TYPE_SIZE_UNIT (gfc_get_element_type (type));
-
-  /* Convert to size_t.  */
-  element_size = fold_convert (size_type_node, tmp);
-
   if (rank == 0)
     return element_size;
 
diff --git a/gcc/fortran/trans-expr.c b/gcc/fortran/trans-expr.c
index 2370f44..07f3ead 100644
--- a/gcc/fortran/trans-expr.c
+++ b/gcc/fortran/trans-expr.c
@@ -3772,12 +3772,6 @@  gfc_conv_subref_array_arg (gfc_se * parmse, gfc_expr * expr, int g77,
       offset = gfc_index_zero_node;
       for (n = 0; n < dimen; n++)
 	{
-	  tmp = gfc_conv_descriptor_extent_get (parmse->expr,
-						gfc_rank_cst[n]);
-	  gfc_conv_descriptor_ubound_set (&parmse->pre,
-					  parmse->expr,
-					  gfc_rank_cst[n],
-					  tmp);
 	  gfc_conv_descriptor_lbound_set (&parmse->pre,
 					  parmse->expr,
 					  gfc_rank_cst[n],